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Sound randomly stops working; restart temporarily fixes it.

After about an hour or so of being on, my computer will stop playing audio. It seems to happen randomly, and only comes back on when I restart, but it will go out again afterwards.

I have my PC connected to a monitor via HDMI, and a digital audio cable from the PC to a stereo. Neither output will play sounds from the PC, but both they can still play from other sources with no problem. I tried checking the drivers in the control panel and nothing seems to be wrong there.

I'm using Windows 7 Home Premium, Service Pack 1.

Any assistance on this matter is greatly appreciated. Thanks in advance.

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Please post back if you are still having the same issues and then post the computer model, device attached (monitor, speaker brand) next time also. In addition to the information,

Try downloading Speccy and then install the program. To post and publish a snapshot of your PC.. In the Menu bar, click File -> Publish Snapshot. Click Yes > then Copy to Clipboard. On your next reply, right-click on a empty space and click Paste on reply box then click Post.